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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8541f10e7131501950a36f036c1b0f9a3d6f01005108e132a6e421a09159c5c' 
  AND token = 'hNE86B+toE1r1sAV9v+Hlhrw+/zCegqWdUmzKmWfqXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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