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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44694e03e6a2878d289a8b406c217d29b7489f11a4f8a8536fee96e509540526' 
  AND token = '5YAPXAWnh2qOtfwfcZRpQ3EinaI9fDTjAkBdxfKNKtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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