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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4661cbff3be76785f1e037a67167f0798722f2e5bc1a9d3940471c148e0dd83e' 
  AND token = 'yFR3jKKu6cBIs52yIw8qFSS/qC1CY/SOjytu0OjS84M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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