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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b01d78610cc6ec4a89caa534d03bfa819767edd42f9ab9c128d81d90869602c' 
  AND token = 'RnfVipYPQrd/1XFZQb7iq+3O2NSSwwVT4yApSx5LTi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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