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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97f2e515a8739d87c3537e1eb964f2d7cf90e5bbab0f56bf4c26943cbcac03f7' 
  AND token = 'aeasN/Eb0v4vVbWiPgRB6/CeC//KHokEVtS9sVSoDkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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