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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '319a8480e036239e708697596f090d43d2f35ab73c65ed39879e3f119dc9c98e' 
  AND token = 'Ps36wOL8TJKjkj0t8kN/yyS69mRqVCH321Y4DyO9EFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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