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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90240d811c995848004e8f1c7906fe00d4794d78d3caddb333f34d1961dd039a' 
  AND token = 'niZ6INyGxYsnlyeINOMXZ9HzOHfzv9gHR9jf8SY5dFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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