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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e682a8f6069b22dbee0bfedbd80ab89cdf3e47006e6737baec0f39e6b2c4d8b6' 
  AND token = '4Kea45/tLqChNXyBmBOVpNc7s4HVBYCsjpL603b9oLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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