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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24391eb8c041d339f6877f4c6711052da2e8fac755fd0e23096dc832b75bd12a' 
  AND token = 'ny92l2kcQQYJeCmwCs1+6H9St2Ev1pctgaehp2pOqoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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