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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b52946760f7a61f2bc117511cf23e74cbb4740c5505cb7e2e7a5f6a24f12c904' 
  AND token = 'rZgUbsKNycj2m6sNL5JLjBZVdpkMWcKC5z0Q/t4O9ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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