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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae7e58cee659431c81fac2c66d557b3f0f20beaed508340481970e6351207d69' 
  AND token = 'Q69lvImVKw4P9oca3nc4eGMYf/Yn227Vsg9Dy27jkmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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