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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3381f20191df7c3e11c9d84015663877f2c46e9b2ef367875ae9f841347c80b1' 
  AND token = 'oJSfHyrxD7ksq74C7asBC9pp+M14cd/JYHW2Q1GvtJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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