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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c528e6481d4c13869e99c3c644a65dbce5984c6b67048d54ecad3c0ff52e494a' 
  AND token = 'HepG4YB2+gWiVeg4d64oN4Wy3RL2qffsoAIqehsuL5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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