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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30249ae0e7bf44dcebea41956c2f94953b0c18bb426c24ea59eafabcc596db69' 
  AND token = 'VmffSgb9s5TK8yb3tcJW67ERl+GSBRue42heEHUKKmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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