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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d8c9a13fc8283471ac258155eb1253ec6fc2fd330806f2b9b3e3cfa2fc456bd' 
  AND token = 'NT6vvV+HE+UQC0h3TA581pEcav7XbKtxUbGQODHQLB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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