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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63f136211069bb0890c4b016c5a1850663ea41f9b391543a8e8a449fbae12a11' 
  AND token = 'mKtj+8F6CGIq45BCCYZd5XXQ6U7Hg4iKLrMH3KHI1E4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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