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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1b43896ed4cc77f5a83e63a18ced613510c28337986e707fd1b092dcc53b7d2' 
  AND token = 'dajOMBp6OfgCv0sIzkZ6bx38gp+Vosh6evIbbIGrsoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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