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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab63bd234be99555c319504ab1a1471252bad8bb87325e717ed31f89835db111' 
  AND token = 'ftkcGuESQ6T1JwysAE05/zOdmBE4MtyP2KyzP/Xggyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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