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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf8d96a75c5a0dd8d0ac0a3ae7041736db24d487e4876d46206f78e76fd43cef' 
  AND token = 'mFH91I8JFlGwlSXf6hIew2HjMn3siQOvm+s1ReuMgbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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