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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6800b0468309329394026d3998a2d784fc6fd35db5f1676afab47577cbbb12be' 
  AND token = '8lpxwZvfV1zziqTdlCv6oA5qypi46kv35dWQ95say8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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