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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f1f2c153173d24b8e337a3f17a7fe7fc5f950f70080e28eb78469407443906d' 
  AND token = 'qrmzFTmV3gVfKjKd6z0ySEEK9fGkaOC67KTgclj3yJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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