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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '465c13d664af6969ba21746f3e82c86011f6256b3f7419bf649411071e5713ce' 
  AND token = 'fc2lE2nQK6LNrnbPsP+pc5CLMfTlr1cHNIDsNPY2G+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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