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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f60a9e873140c95f3f1f46c50a8d47f61279ee7e0b04553774d3eda653fe4b3c' 
  AND token = 'gsj6g/NIztP1PFdBN+pbLmmH6SBN/NGKipypDH7eI4o=' 
  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"
    }
  }
}