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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ffe75a99c282175ae5d2d6d4d87e44179016c70070d43a9e0a28380a0e06b58' 
  AND token = '54zcmRMne6BVV5fn7aL2yeAtM3dPe8rO/iz3k2HcV8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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