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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a39bb92684db8f325476a3522d97a7f26d43ef426ba8ff601e55dc61b80c6ce1' 
  AND token = 'ekgt31OV9xgfzL/B5Vs3QF4fzwPn7ocGJ3is3FiiM2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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