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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bd75a4db6fed18a48675f32947956ac298d0230fafec7d9d347d24d35112f9b' 
  AND token = '5hiArUOF3dc04s0FLssGV2seb5dehYOmgcK0WWSSDUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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