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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70b556a6215d062323992c82027fcab72a631098ec2a1690b2e7d843a55c233c' 
  AND token = '0WGHRCpt2cEJ+2UKJmQWQvmiwzfvoAvZEHqFJc+W90k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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