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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b26ce8de5955ee909cb4357f18f5d7e00d5ea21a20065be06553ca4122c5635' 
  AND token = 'SWkFlDXX9GKlnJ70VM0TP7L6ghV1iHe3H+C91LYXe98=' 
  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"
    }
  }
}