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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fa1c408bb53708fb515f07538ac665ea6325309da4d89b5f022f96b80c810c7' 
  AND token = 'uiOAc12HazOPm8sfNXYK3FIHbJ0O+uyssdf3jMrpFYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}