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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '462f5db74212929100062735be0a2aa6a89e2c867749a0f34c9dc8ca42d2ae46' 
  AND token = 'bM2s+omxYpi3g0xE7ovoIbNqDLqy8sSxmH+vMJo2A54=' 
  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"
    }
  }
}