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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f65cbfc64a57c4806f2c92f4b7027d653f9fc07547170081b964a027595eb130' 
  AND token = '9MNkJ7/oFJNFUuSOm2Fbyauwwnif4c3ERLrn8WdcibQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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