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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e24c00bf498161ab3f61709fbb8df9b723cd6f88e4cff4a73abc4e2a4fd33b5' 
  AND token = 'x5UwqW4ZpyC1fAl2Ulz6MFjTyfoUv6PyFSJb0eC3SpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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