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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a2a8b8b8408430baf9a1b083a5424ae1d2e5121c0e7eb82007a4ffc3fd5433a' 
  AND token = 'OINrLHrzcQVp/1zm8Mhk7m1lwgDXyXZa84xR6dYd21s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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