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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecc141247a1e4a407ee7dea3b2da6a76b318043533007706b86193d5eb743466' 
  AND token = 'ZMoi8s9W4ByttWVYp09ubSP2G2a5qTFyLBigLS0z2LY=' 
  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"
    }
  }
}