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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34f8b9ab9546a8dd9bb719f900bcb3db8f4e7432949301305a37fcd0723b21de' 
  AND token = '8uOAk+vEiGg508RqWK0EUHGl2Aaa7C+psS4c+4Bk8sM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00990

JSON explain

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