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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eab4a3fa3a445365d0a6e9ba394840827c7d63ea701661b2e2119f0ae39acc1c' 
  AND token = 'JYmUmDig3dWjTH0ZeB9nmwUsox0o1ZrZNy6DbpZroAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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