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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b30b36aadf5a228961cb6e9efabf510b9189ebe3a39bb299d8bba897c70033d' 
  AND token = 'BjzCxXsWNXQ90kMSQL6GN54WgNwqOOM4c788Ja65N9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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