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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51d5e3bcb1b91aa11977d28974b6cfd1acb897df89c3cb05b863bb51001c71b8' 
  AND token = 'cRwuOGGLJBKXyn7VKSHm+Qk0Osej3f+Oi7Fib7YsZ9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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