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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4decfe80a81300c32c03642bae160e4911cd3bf84d78d100a7fd2fe666100c8' 
  AND token = 'OS6C2oMEFB8T92+q3qtjHOrvbS0f2IUvEp1D55TUaBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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