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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8969b3f3e4f3ef6ce272cf09a1121c5d448838e240a32b2e4d43842ad1ba8edf' 
  AND token = 'aj0T2kzo1lktTYrC7JVyZD+ayIIAsDdMt3Fw0dei4xM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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