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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4937e2542a8c8f23d28bb905a8a51080115d03e8b980dfa54007ae4077f416a3' 
  AND token = 'wWDgltqhx4prac5DS2nu35srgL4spNPGgdNU26T0YFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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