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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd29a712c2339a5c576f658bb0de3a58ebbb98f7559ae132efa8502c068d2ccb2' 
  AND token = 'aSKbrDaLADaTbefVOnuQm/4Wz/z9/QAkj92+NJO0Vc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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