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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74ac1cfffc33da1f75a4d7a98c6268711c197ee89b6950bedf482dd4c23b3bba' 
  AND token = 'EvSzhB35xUXbuXcyyy0cG8XbTTR88hX22U6C2uWyITs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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