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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea9146f8a42662fe9d5190fb9b1d2ce957de7ffe58112d3e1f603c6509cc048b' 
  AND token = 'hrfqmORBzj2H3YAWw1tfb9lsCjUi9m1n06MrE2KndME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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