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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63f6402b53e8f37e25c4d919f89c78706a4c3fc6d04b57e008981035aa0f0f65' 
  AND token = 'fW8CuevjVFGVDjJVYa7jcaeRtLx1xPU7mOADmRQw0yI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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