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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '153f1ae7a839a55695379f5635879e3aa7eec19b4384e154ec1b4769d82200b8' 
  AND token = '+tn2x143dPcewKIKFS6YThOWOOqgRG+8CHPtM1sm1OI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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